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-rw-r--r--arch/m68knommu/mm/Makefile5
-rw-r--r--arch/m68knommu/mm/fault.c57
-rw-r--r--arch/m68knommu/mm/init.c231
-rw-r--r--arch/m68knommu/mm/kmap.c56
-rw-r--r--arch/m68knommu/mm/memory.c132
5 files changed, 481 insertions, 0 deletions
diff --git a/arch/m68knommu/mm/Makefile b/arch/m68knommu/mm/Makefile
new file mode 100644
index 000000000000..fc91f254f51b
--- /dev/null
+++ b/arch/m68knommu/mm/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the linux m68knommu specific parts of the memory manager.
+#
+
+obj-y += init.o fault.o memory.o kmap.o
diff --git a/arch/m68knommu/mm/fault.c b/arch/m68knommu/mm/fault.c
new file mode 100644
index 000000000000..6f6673cb5829
--- /dev/null
+++ b/arch/m68knommu/mm/fault.c
@@ -0,0 +1,57 @@
+/*
+ * linux/arch/m68knommu/mm/fault.c
+ *
+ * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
+ * Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
+ *
+ * Based on:
+ *
+ * linux/arch/m68k/mm/fault.c
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ */
+
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+
+#include <asm/system.h>
+#include <asm/pgtable.h>
+
+extern void die_if_kernel(char *, struct pt_regs *, long);
+
+/*
+ * This routine handles page faults. It determines the problem, and
+ * then passes it off to one of the appropriate routines.
+ *
+ * error_code:
+ * bit 0 == 0 means no page found, 1 means protection fault
+ * bit 1 == 0 means read, 1 means write
+ *
+ * If this routine detects a bad access, it returns 1, otherwise it
+ * returns 0.
+ */
+asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
+ unsigned long error_code)
+{
+#ifdef DEBUG
+ printk (KERN_DEBUG "regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
+ regs->sr, regs->pc, address, error_code);
+#endif
+
+ /*
+ * Oops. The kernel tried to access some bad page. We'll have to
+ * terminate things with extreme prejudice.
+ */
+ if ((unsigned long) address < PAGE_SIZE) {
+ printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
+ } else
+ printk(KERN_ALERT "Unable to handle kernel access");
+ printk(KERN_ALERT " at virtual address %08lx\n",address);
+ die_if_kernel("Oops", regs, error_code);
+ do_exit(SIGKILL);
+
+ return 1;
+}
+
diff --git a/arch/m68knommu/mm/init.c b/arch/m68knommu/mm/init.c
new file mode 100644
index 000000000000..89f0b554ffb7
--- /dev/null
+++ b/arch/m68knommu/mm/init.c
@@ -0,0 +1,231 @@
+/*
+ * linux/arch/m68knommu/mm/init.c
+ *
+ * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
+ * Kenneth Albanowski <kjahds@kjahds.com>,
+ * Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
+ *
+ * Based on:
+ *
+ * linux/arch/m68k/mm/init.c
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ *
+ * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
+ * DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
+ */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/bootmem.h>
+#include <linux/slab.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/machdep.h>
+
+#undef DEBUG
+
+extern void die_if_kernel(char *,struct pt_regs *,long);
+extern void free_initmem(void);
+
+/*
+ * BAD_PAGE is the page that is used for page faults when linux
+ * is out-of-memory. Older versions of linux just did a
+ * do_exit(), but using this instead means there is less risk
+ * for a process dying in kernel mode, possibly leaving a inode
+ * unused etc..
+ *
+ * BAD_PAGETABLE is the accompanying page-table: it is initialized
+ * to point to BAD_PAGE entries.
+ *
+ * ZERO_PAGE is a special page that is used for zero-initialized
+ * data and COW.
+ */
+static unsigned long empty_bad_page_table;
+
+static unsigned long empty_bad_page;
+
+unsigned long empty_zero_page;
+
+extern unsigned long rom_length;
+
+void show_mem(void)
+{
+ unsigned long i;
+ int free = 0, total = 0, reserved = 0, shared = 0;
+ int cached = 0;
+
+ printk(KERN_INFO "\nMem-info:\n");
+ show_free_areas();
+ i = max_mapnr;
+ while (i-- > 0) {
+ total++;
+ if (PageReserved(mem_map+i))
+ reserved++;
+ else if (PageSwapCache(mem_map+i))
+ cached++;
+ else if (!page_count(mem_map+i))
+ free++;
+ else
+ shared += page_count(mem_map+i) - 1;
+ }
+ printk(KERN_INFO "%d pages of RAM\n",total);
+ printk(KERN_INFO "%d free pages\n",free);
+ printk(KERN_INFO "%d reserved pages\n",reserved);
+ printk(KERN_INFO "%d pages shared\n",shared);
+ printk(KERN_INFO "%d pages swap cached\n",cached);
+}
+
+extern unsigned long memory_start;
+extern unsigned long memory_end;
+
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses of available kernel virtual memory.
+ */
+void paging_init(void)
+{
+ /*
+ * Make sure start_mem is page aligned, otherwise bootmem and
+ * page_alloc get different views of the world.
+ */
+#ifdef DEBUG
+ unsigned long start_mem = PAGE_ALIGN(memory_start);
+#endif
+ unsigned long end_mem = memory_end & PAGE_MASK;
+
+#ifdef DEBUG
+ printk (KERN_DEBUG "start_mem is %#lx\nvirtual_end is %#lx\n",
+ start_mem, end_mem);
+#endif
+
+ /*
+ * Initialize the bad page table and bad page to point
+ * to a couple of allocated pages.
+ */
+ empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+ empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+ empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+ memset((void *)empty_zero_page, 0, PAGE_SIZE);
+
+ /*
+ * Set up SFC/DFC registers (user data space).
+ */
+ set_fs (USER_DS);
+
+#ifdef DEBUG
+ printk (KERN_DEBUG "before free_area_init\n");
+
+ printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
+ start_mem, end_mem);
+#endif
+
+ {
+ unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+
+ zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
+ zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
+#ifdef CONFIG_HIGHMEM
+ zones_size[ZONE_HIGHMEM] = 0;
+#endif
+ free_area_init(zones_size);
+ }
+}
+
+void mem_init(void)
+{
+ int codek = 0, datak = 0, initk = 0;
+ unsigned long tmp;
+ extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end;
+ extern unsigned int _ramend, _rambase;
+ unsigned long len = _ramend - _rambase;
+ unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */
+ unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem);
+#endif
+
+ end_mem &= PAGE_MASK;
+ high_memory = (void *) end_mem;
+
+ start_mem = PAGE_ALIGN(start_mem);
+ max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT;
+
+ /* this will put all memory onto the freelists */
+ totalram_pages = free_all_bootmem();
+
+ codek = (&_etext - &_stext) >> 10;
+ datak = (&_ebss - &_sdata) >> 10;
+ initk = (&__init_begin - &__init_end) >> 10;
+
+ tmp = nr_free_pages() << PAGE_SHIFT;
+ printk(KERN_INFO "Memory available: %luk/%luk RAM, %luk/%luk ROM (%dk kernel code, %dk data)\n",
+ tmp >> 10,
+ len >> 10,
+ (rom_length > 0) ? ((rom_length >> 10) - codek) : 0,
+ rom_length >> 10,
+ codek,
+ datak
+ );
+}
+
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ int pages = 0;
+ for (; start < end; start += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(start));
+ set_page_count(virt_to_page(start), 1);
+ free_page(start);
+ totalram_pages++;
+ pages++;
+ }
+ printk (KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
+}
+#endif
+
+void
+free_initmem()
+{
+#ifdef CONFIG_RAMKERNEL
+ unsigned long addr;
+ extern char __init_begin, __init_end;
+ /*
+ * The following code should be cool even if these sections
+ * are not page aligned.
+ */
+ addr = PAGE_ALIGN((unsigned long)(&__init_begin));
+ /* next to check that the page we free is not a partial page */
+ for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ set_page_count(virt_to_page(addr), 1);
+ free_page(addr);
+ totalram_pages++;
+ }
+ printk(KERN_NOTICE "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
+ (addr - PAGE_ALIGN((long) &__init_begin)) >> 10,
+ (int)(PAGE_ALIGN((unsigned long)(&__init_begin))),
+ (int)(addr - PAGE_SIZE));
+#endif
+}
+
diff --git a/arch/m68knommu/mm/kmap.c b/arch/m68knommu/mm/kmap.c
new file mode 100644
index 000000000000..04213e1c1e57
--- /dev/null
+++ b/arch/m68knommu/mm/kmap.c
@@ -0,0 +1,56 @@
+/*
+ * linux/arch/m68knommu/mm/kmap.c
+ *
+ * Copyright (C) 2000 Lineo, <davidm@snapgear.com>
+ * Copyright (C) 2000-2002 David McCullough <davidm@snapgear.com>
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+#undef DEBUG
+
+/*
+ * Map some physical address range into the kernel address space.
+ */
+void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
+{
+ return (void *)physaddr;
+}
+
+/*
+ * Unmap a ioremap()ed region again.
+ */
+void iounmap(void *addr)
+{
+}
+
+/*
+ * __iounmap unmaps nearly everything, so be careful
+ * it doesn't free currently pointer/page tables anymore but it
+ * wans't used anyway and might be added later.
+ */
+void __iounmap(void *addr, unsigned long size)
+{
+}
+
+/*
+ * Set new cache mode for some kernel address space.
+ * The caller must push data for that range itself, if such data may already
+ * be in the cache.
+ */
+void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
+{
+}
diff --git a/arch/m68knommu/mm/memory.c b/arch/m68knommu/mm/memory.c
new file mode 100644
index 000000000000..0eef72915e61
--- /dev/null
+++ b/arch/m68knommu/mm/memory.c
@@ -0,0 +1,132 @@
+/*
+ * linux/arch/m68knommu/mm/memory.c
+ *
+ * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
+ * Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
+ *
+ * Based on:
+ *
+ * linux/arch/m68k/mm/memory.c
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/io.h>
+
+/*
+ * cache_clear() semantics: Clear any cache entries for the area in question,
+ * without writing back dirty entries first. This is useful if the data will
+ * be overwritten anyway, e.g. by DMA to memory. The range is defined by a
+ * _physical_ address.
+ */
+
+void cache_clear (unsigned long paddr, int len)
+{
+}
+
+
+/*
+ * Define cache invalidate functions. The ColdFire 5407 is really
+ * the only processor that needs to do some work here. Anything
+ * that has separate data and instruction caches will be a problem.
+ */
+#ifdef CONFIG_M5407
+
+static __inline__ void cache_invalidate_lines(unsigned long paddr, int len)
+{
+ unsigned long sset, eset;
+
+ sset = (paddr & 0x00000ff0);
+ eset = ((paddr + len) & 0x0000ff0) + 0x10;
+
+ __asm__ __volatile__ (
+ "nop\n\t"
+ "clrl %%d0\n\t"
+ "1:\n\t"
+ "movel %0,%%a0\n\t"
+ "addl %%d0,%%a0\n\t"
+ "2:\n\t"
+ ".word 0xf4e8\n\t"
+ "addl #0x10,%%a0\n\t"
+ "cmpl %1,%%a0\n\t"
+ "blt 2b\n\t"
+ "addql #1,%%d0\n\t"
+ "cmpil #4,%%d0\n\t"
+ "bne 1b"
+ : : "a" (sset), "a" (eset) : "d0", "a0" );
+}
+
+#else
+#define cache_invalidate_lines(a,b)
+#endif
+
+
+/*
+ * cache_push() semantics: Write back any dirty cache data in the given area,
+ * and invalidate the range in the instruction cache. It needs not (but may)
+ * invalidate those entries also in the data cache. The range is defined by a
+ * _physical_ address.
+ */
+
+void cache_push (unsigned long paddr, int len)
+{
+ cache_invalidate_lines(paddr, len);
+}
+
+
+/*
+ * cache_push_v() semantics: Write back any dirty cache data in the given
+ * area, and invalidate those entries at least in the instruction cache. This
+ * is intended to be used after data has been written that can be executed as
+ * code later. The range is defined by a _user_mode_ _virtual_ address (or,
+ * more exactly, the space is defined by the %sfc/%dfc register.)
+ */
+
+void cache_push_v (unsigned long vaddr, int len)
+{
+ cache_invalidate_lines(vaddr, len);
+}
+
+/* Map some physical address range into the kernel address space. The
+ * code is copied and adapted from map_chunk().
+ */
+
+unsigned long kernel_map(unsigned long paddr, unsigned long size,
+ int nocacheflag, unsigned long *memavailp )
+{
+ return paddr;
+}
+
+
+int is_in_rom(unsigned long addr)
+{
+ extern unsigned long _ramstart, _ramend;
+
+ /*
+ * What we are really trying to do is determine if addr is
+ * in an allocated kernel memory region. If not then assume
+ * we cannot free it or otherwise de-allocate it. Ideally
+ * we could restrict this to really being in a ROM or flash,
+ * but that would need to be done on a board by board basis,
+ * not globally.
+ */
+ if ((addr < _ramstart) || (addr >= _ramend))
+ return(1);
+
+ /* Default case, not in ROM */
+ return(0);
+}
+